I looked at two of his homeopathy books (at the Wellcome library in London): Ruddock, E. Harris. Text Book of Modern Medicine and Surgery on Homeopathic Principles. London: Homoeopathic Publishing Co.; New York: Boericke & Tafel, 1983.
Ruddock, E. Harris. The Homeopathic Vade Mecum of Modern Medicine and Surgery. London: Homoeopathic Publishing Co.; New York: Boericke and Tafel, 1893.

Dear Sue Young,
Though I have not yet found out when Dr. Edgar Whitaker died, I have found out the following information with regard to who he was and his relationship to the journal, The Homœopathic World.
His full name is Leonard Edgar Whitaker, and he was born in about 1876. (1) He was the son of the Joseph Whitaker, a publisher of a wide variety of material including theological and books on the publishing trade. He is best known as the editor and publisher of Whitaker’s Almanack. (2)
The Almanack was published by J. Whitaker and Sons from 1868 – 1997, with Joseph Whitaker its editor from 1868 – 1895, with his son, Cuthbert Wilfred Whitaker, taking over after his father’s death in 1895. (3)
In the December 1931 number of The Homœopathic World, in an article entitled, ‘John Henry Clarke, An Apperciation’ Dr. Whitaker says that it was after Dr. Compton Burnett edited his last number of The Homœopathic World in April 1885, that Joseph Whitaker

‘. . took over the whole of his business and removed it to the present office . .’. (4)

Dr. John Henry Clarke commenced as editor the following month in May 1885. (4) The journal was published by The Homœopathic Publishing Company of 12 Warwick Lane, E.C.4. (5)
A list of London Publishers and Printers 1800-1870 gives Joseph Whitaker as being at 12 Warwick Lane from 1887 until his death in 1895. (2)
Edgar Whitaker in the 1901 UK census is given as being 25 years old, with the qualifications M.R.C.S., L.R.C.P., and his occupation as surgeon. In 1903 he married Evelyn Olave Cox. (1) In 1937, at the probate of the will of Edith Louisa Nimmo (his sister) he is given as being a publisher. (6)
In the December 1931 number of The Homœopathic World, Dr. Whitaker also states that

‘. . as Manager of the parent firm also I am so busy all day long.’ (7)

I take this to mean that the parent firm of The Homœopathic Publishing Company was J. Whitaker and Sons.
Why J. Whitaker and Sons would publish homœopathic books under a different name is understandable from the following quote from ‘The Faces of Homœopathy’ by Julian Winston:

‘Noting that “Dr. Ruddock had been compelled to keep his publishing department in his own basement,” Clarke established his own publishing house for his books – The Homeopathic Publishing Company – for no reputable publishing house wanted to touch “what was ‘officially’ anathema.”’ (8)

The above quotation appears to be not quite right. Dr. Edward Harris Ruddock founded The Homœopathic World in 1865. Dr. Edgar Whitaker says it was published from 2 Finsury Circus until 1885 when Joseph Whitaker took over. (4)
This information appears to suggest that J. Whitaker and Sons should be given credit for publishing the The Homœopathic World under the name of The Homœopathic Publishing Company, rather than its editor John Henry Clarke.
What do you think?
Yours faithfully
Barry Shaw

I’m wanting to find out more about E.H. Ruddock, can you tell me where you located this much information because I cannot find anything except your article. Short of going to London, and looking through articles there, what can I do to find out more?